Arrays & ArrayLists Java

An ArrayList containing Strings, named arr.

ArrayList<String> arr = new ArrayList<String>();

An ArrayList containing whole numbers, named arr.

ArrayList<Integer> arr = new ArrayList<Integer>();

Add an item to an ArrayList called arr.

arr.add();

Change the 3rd item, in an ArrayList of Strings called arr, to "Puppy".

arr.set(3, "Puppy");

How long an ArrayList called arr is.

arr.size();

Get an item from an ArrayList called arr.

arr.get();

An Array containing Strings, named arr, with 5 items.

String[] arr = new String[5];

An Array containing Strings, named arr, with "Cat", "Bird", "Dog", "Fish" in it.

String[] arr = {"Cat", "Bird", "Dog", "Fish"};

Change the 3rd item, in an Array of Strings called arr, to "Puppy".

arr[3] = "Puppy";

How long an Array called arr is.

arr.length;